Question

well I am analyzing a javascript code, but I got confuse in some lines, for example I have this code

function getStyle(el,styleProp)
 {
var x = document.getElementById(el);
if (x.currentStyle)
    var y = x.currentStyle[styleProp];
else if (window.getComputedStyle)
    var y = document.defaultView.getComputedStyle(x,null).getPropertyValue(styleProp);

if (y.substr(0, 1) == "#"){ return y; } else {

var value = y.split(',');

var R = value[0].substr(4);
var G = value[1];
var B = value[2].substr(0, value[2].length-1);

var RGB =  "#" + toHex(R)+ toHex(G)+toHex(B);

return RGB;

 }
}


function toHex(N) {
if (N==null) return "00";
N=parseInt(N); if (N==0 || isNaN(N)) return "00";
N=Math.max(0,N); N=Math.min(N,255); N=Math.round(N);
return "0123456789ABCDEF".charAt((N-N%16)/16)
  + "0123456789ABCDEF".charAt(N%16);
}




function pw (form)
{

var d1, d2, d3;

if (navigator.appName == "Netscape"){
d1= getStyle('content', 'background-color'); 
} else {
d1= getStyle('content', 'backgroundColor'); 
}
     d2=form.Name.value;
     d3=form.Name2.value;

Firs of all, I dont know what the variables “R”, “G” and “B” are doing?, are they affecting the variable “d1”? I know that variables “d2” and “d3” are the values of what they said, but what is the value of the variable “d1”?

Some help will be appreciated. Tnx.

Answer 1

This code is pretty straight forward. Variables R, G and B each contain a color, R – red, G – green and B – blue. This only happens if the style doesn’t already represent the color through in a hex format. They are there to be able to convert color back to hex and return in. So yes, in a way they do affect the variable d1. If background-color style is going to be set like this: background-color: #FF00FF d1 is going to be #FF00FF. If the background color is going to be set like this: background-color: rgb(00, 255, 00) d1 is going to be #0000FF, since this function expects some none-existing format like this: background-color: 00, 255, 00 (this is not valid CSS).

In general this seems like a poorly named and written code.